<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{this.currentCity}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div
            class="button-wrapper"
            v-for="item of hotCities"
            :key="item.id"
            @click="handleCityClick(item.name)"
          >
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area" v-for="(item, key) of cities" :key="key" :ref="key">
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div
            class="item border-bottom"
            v-for="innerItem of item"
            :key="innerItem.id"
            @click="handleCityClick(innerItem.name)"
          >{{innerItem.name}}</div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import { mapState, mapMutations } from 'vuex'
import Bscroll from 'better-scroll'
export default {
  name: 'CityList',
  props: {
    cities: Object,
    hotCities: Array,
    letter: String
  },
  mounted() {
    this.scroll = new Bscroll(this.$refs.wrapper)
  },
  methods: {
    handleCityClick(city) {
      // 派发一个名字为changeCity的Actions，传入city参数
      // 使用Actions调用Mutations间接改变state的值
      // this.$store.dispatch('changeCity', city)
      // 直接使用Mutations改变数据
      // this.$store.commit('changeMutationsCity', city)
      this.changeMutationsCity(city)
      this.$router.push('/')
    },
    // 辅助函数
    ...mapMutations(['changeMutationsCity'])
  },
  computed: {
    ...mapState({
      currentCity: 'city'
    })
  },
  watch: {
    // 监听点击字母的变化，显示到第一行
    letter() {
      if (this.letter) {
        // console.log(this.$refs[this.letter])
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
      // console.log(this.letter)
    }
  }
}
</script>

<style scoped lang="stylus">
@import '~styles/varibles.styl';

.border-topbottom {
  &:before {
    border-color: #e0e0e0;
  }

  &:after {
    border-color: #e0e0e0;
  }
}

.border-bottom {
  &:before {
    border-color: #e0e0e0;
  }
}

.list {
  position: absolute;
  top: 1.58rem;
  left: 0;
  right: 0;
  bottom: 0;
  // background: red;
  overflow: hidden;

  .title {
    overflow: hidden;
    line-height: 0.44rem;
    background: #f5f5f5;
    padding: 0.1rem 0.2rem;
    color: #666;
    font-size: 0.24rem;
  }

  .button-list {
    padding: 0.16rem 0.6rem 0.16rem 0.1rem;
    overflow: hidden;

    .button-wrapper {
      width: 33.33%;
      float: left;

      .button {
        flex: 1;
        margin: 0.1rem;
        padding: 0.1rem 0;
        text-align: center;
        margin: 0.1rem;
        border: 0.02rem solid #ccc;
        border-radius: 0.06rem;
      }
    }
  }

  .item-list {
    line-height: 0.76rem;
    color: #666;
    padding-left: 0.2rem;
  }
}
</style>
